/*
 * Zebra next hop tracking header
 * Copyright (C) 2013 Cumulus Networks, Inc.
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef _ZEBRA_RNH_H
#define _ZEBRA_RNH_H

#include "prefix.h"
#include "vty.h"

/* Nexthop structure. */
struct rnh {
	uint8_t flags;

#define ZEBRA_NHT_CONNECTED  	0x1
#define ZEBRA_NHT_DELETED       0x2
#define ZEBRA_NHT_EXACT_MATCH   0x4

	/* VRF identifier. */
	vrf_id_t vrf_id;

	struct route_entry *state;
	struct prefix resolved_route;
	struct list *client_list;
	struct list
		*zebra_static_route_list; /* static routes dependent on this NH
					     */
	struct list
		*zebra_pseudowire_list; /* pseudowires dependent on this NH */
	struct route_node *node;
	int filtered[ZEBRA_ROUTE_MAX]; /* if this has been filtered for client
					  */
};

typedef enum { RNH_NEXTHOP_TYPE, RNH_IMPORT_CHECK_TYPE } rnh_type_t;

extern int zebra_rnh_ip_default_route;
extern int zebra_rnh_ipv6_default_route;

static inline int rnh_resolve_via_default(int family)
{
	if (((family == AF_INET) && zebra_rnh_ip_default_route)
	    || ((family == AF_INET6) && zebra_rnh_ipv6_default_route))
		return 1;
	else
		return 0;
}

extern struct rnh *zebra_add_rnh(struct prefix *p, vrf_id_t vrfid,
				 rnh_type_t type);
extern struct rnh *zebra_lookup_rnh(struct prefix *p, vrf_id_t vrfid,
				    rnh_type_t type);
extern void zebra_free_rnh(struct rnh *rnh);
extern void zebra_delete_rnh(struct rnh *rnh, rnh_type_t type);
extern void zebra_add_rnh_client(struct rnh *rnh, struct zserv *client,
				 rnh_type_t type, vrf_id_t vrfid);
extern void zebra_register_rnh_static_nh(vrf_id_t, struct prefix *,
					 struct route_node *);
extern void zebra_deregister_rnh_static_nexthops(vrf_id_t,
						 struct nexthop *nexthop,
						 struct route_node *rn);
extern void zebra_deregister_rnh_static_nh(vrf_id_t, struct prefix *,
					   struct route_node *);
extern void zebra_register_rnh_pseudowire(vrf_id_t, struct zebra_pw *);
extern void zebra_deregister_rnh_pseudowire(vrf_id_t, struct zebra_pw *);
extern void zebra_remove_rnh_client(struct rnh *rnh, struct zserv *client,
				    rnh_type_t type);
extern void zebra_evaluate_rnh(vrf_id_t vrfid, int family, int force,
			       rnh_type_t type, struct prefix *p);
extern void zebra_print_rnh_table(vrf_id_t vrfid, int family, struct vty *vty,
				  rnh_type_t);
extern char *rnh_str(struct rnh *rnh, char *buf, int size);
extern int zebra_cleanup_rnh_client(vrf_id_t vrf, int family,
				    struct zserv *client, rnh_type_t type);
#endif /*_ZEBRA_RNH_H */
